Show that cot^2(p/7) + cot^2(2p/7) + cot^2(3p/7) = 5.
Follow Math Help Forum on Facebook and Google+
Originally Posted by perash Show that cot^2(p/7) + cot^2(2p/7) + cot^2(3p/7) = 5. For what value(s) of p? This is not true in general. -Dan EDIT: Aaaah. You meant .
See this: http://www.mathisfunforum.com/viewto...d=79371#p79371 It was proved that are the roots of the equation . Hence are the roots of the equation , i.e. of the equation .